Loss of temperature sensation is one of the symptoms of spinal cord cavitation, which is caused by disruption of the thalamic fibers of the spinal cord. The spinal cavity is often surrounded by gliosis, which is the result of the formation of a tubular cavity in the spinal cord for a variety of reasons. The onset of the disease is slow, and the clinical manifestations are symptoms of nerve damage in the affected spinal cord segments, characterized by hyperalgesia, hyperalgesia and loss of temperature sensation, and dissociative sensory deficits with preservation of deep sensation, as well as motor deficits and neurotrophic deficits with damage to the long tracts of the spinal cord. The loss of warm sensation requires the following tests: 1, cerebrospinal fluid examination Pressure and composition of most normal cavities can also cause spinal canal obstruction when the protein content of cerebrospinal fluid is increased. 2.X-ray radiographs can confirm the accompanying skeletal deformities spinal oil sulphonography can be seen in the spinal cord widening delayed myelography. 3, CT scan and spinal cord magnetic resonance imaging can show the morphology and extent of the cavity site, especially the latter is the ideal detection method. 4.Muscle strength Firstly, observe the mobility of the limbs during voluntary flow, and then test the muscle strength of the upper and lower limb extensor and flexor muscles, the grip strength of both hands and finger-splitting strength by means of confrontation action. The limitation of mobility due to pain, joint ankylosis or hypertonicity must be excluded. 5.Muscle volume Observe and touch the limbs, trunk and even the face for muscle atrophy and its distribution, and compare both sides. If necessary, use a ruler to measure the circumference of bony signs such as the patella, ankle, wrist bones at certain intervals above and below the opposite position of the limbs on both sides.